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Liberty Recording Multi-Channel Wav files (.dcr files) Introduction The Liberty Recorder creates audio files with a "dcr" extension. A dcr file is a multi-channel audio file with the data saved in .wav file format. The .dcr files could not be given a .wav extension, because other .wav players such as Windows Media Player are not designed to recognize the multi-channel data tracks found within the files. Both .wav files and .dcr files save the audio data in a compressed PCM (.wav) format. Saving the audio data in a standard, compressed .wav format allows any Windows PC to playback the audio using the Liberty Player. Compression The Liberty Recorder can use any standard compression algorithm installed onto the PC. This includes any algorithm provided by the Windows Operating System and any compression algorithm that might be added to the PC. Various compression algorithms have been a standard component of all Windows Operating Systems since Windows'95 and any of these may be used with the Liberty Recorder. These algorithms include, but are not limited to Microsoft ADPCM, and D.S.P. Group Truespeech. Speex is another compression algorithm that will work with the Liberty Recorder. The Speex algorithm was designed specifically to record the spoken word. It delivers a high compression rate with good sound quality. The Speex algorithm may be downloaded using this link. If the Speex codec is used, then please use of one of the Q4 mono (Quality 4) or higher recording attributes. We suggest recording with the Attributes set at "16.8 kBit/s, 16.0 kHz, Mono Q5". Further information about Speex may be obtained from www.speex.org.The following chart provides details on disk space requirements for 4-channel recordings:
* The MS ADPCM and D.S.P. Group Truespeech compression algorithms have been a standard component of all Windows systems, since Windows'95.
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